Method decodePointer

internal/decoder/data_decoder.go:247–280

DecodePointer decodes a pointer from the given offset.

(
	size uint,
	offset uint,
)

// DecodePointer decodes a pointer from the given offset.
func (d *DataDecoder) decodePointer(
	size uint,
	offset uint,
) (uint, uint, error) {
	pointerSize := ((size >> 3) & 0x3) + 1
	newOffset := offset + pointerSize
	if newOffset > uint(len(d.buffer)) {
		return 0, 0, mmdberrors.NewOffsetError()
	}
	pointerBytes := d.buffer[offset:newOffset]
	var prefix uint
	if pointerSize == 4 {
		prefix = 0
	} else {
		prefix = size & 0x7
	}
	unpacked := uintFromBytes(prefix, pointerBytes)

	var pointerValueOffset uint
	switch pointerSize {
	case 1, 4:
		pointerValueOffset = 0
	case 2:
		pointerValueOffset = pointerBase2
	case 3:
		pointerValueOffset = pointerBase3
	default:
		return 0, 0, mmdberrors.NewInvalidDatabaseError("invalid pointer size: %d", pointerSize)
	}

	pointer := unpacked + pointerValueOffset

	return pointer, newOffset, nil
}

// DecodeBool decodes a boolean from the given offset.
func (*DataDecoder) decodeBool(size, offset uint) (bool, uint, error) {